The only reason to update would be if you want (or need) faster/newer cable modem and/or router. There is always some slight benefit of upgrading to newer ones, i.e. they have faster CPU, more RAM, they may support more bonded channels for the cable modem, better QoS for the router side, etc. Still, if you are experiencing no issues you probably won't see much difference, but you will have to setup the new hardware.
I personally prefer separate Wi-Fi router usually.
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